Automatic toll ticketing system incorporating artificial supervision



June 2, 1959 v v B. A. HARRIS 2,889,405

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AUTOMATIC TOLL TICKETING SYSTEM INCQR- PORATING ARTIFH'CIAL SUPERVISION Ben A. Harris, Rochester, N.Y., assignor to Genera! Dynamics Corporation, Rochester, N.Y., a corporation of Delaware Application September 21, 1956, SerialNo. 611,301

4 Claims. (Cl. 179-71) This invention relates to an automatic toll ticketing system and, more particularly, to such a system incorporating means for providing artificial supervision.

The system described herein is basically similar to the automatic toll ticketing system shown and described in the copending application of M. A. Clement and B. A. Harris, Serial No. 536,579, filed September 26, 1955, which application is assigned to the same assignee as the present application, in that items of billing information pertaining to a plurality of successively placed toll calls are automatically recorded in a recorder employing an elongated record medium, and thereafter the elongated medium is played back to produce individual toll tickets from the recorded billing information pertaining to each toll call.

In an automatic toll ticketing system it is essential that a the calling subscriber be charged for only those toll calls where the called party answers, and not for calls which are uncompleted for one reason or another. Normally, a toll ticketing system of the type being described is conditioned for recording all the items of billing information necessary to produce a toll ticket in response to an answer supervision signal generated at that distant ofiice which includes the called subscriber, when the called subscriber answers his phone. However, there are existing telephone systems which do not include means for generating an answer supervision signal. This invention contemplates means for supplying an artificial answer supervision signal, so that automatic toll ticketing may be employed in such-telephone systems.

More specifically, this invention contemplates the use of a timer and means for counting thefull-complement of directive signals which must be dialed in extending a connection from the callingsubscriber to the called subscriber. The timer is connected to the counting means in such a manner that a timing interval interval of predetermined durationis initiated only in responseto the counting means having counted the full complement of directive signals. The timing interval is sufiicieutly long to permit thecalling subscriber to .hang up should the called subscribers station be busy or should the called subscribers station not answer. If the calling subscriber maintains the connection beyond the timing interval, an artificial supervision signal is applied to the .toll ticketing circuitry, which then operates in its normal. manner to record the remaining items of billing information, and the calling subscriber is charged with a call.

Accordingly, it is one object of thepresent invention to provide a tollticketing system incorporating means for providing an artificial answer supervision signal.

It is a further object to providea' toll ticketing system including a timer and counting means so connected as to provide an artificial supervision signal a predetermined time interval after the dialing of the full complement of the directive'signal needed to extend a call to a called subscriber, unless the calling subscriber should hang up prior to'the en'd of'this time interval.

Other objects and advantages of the present invention 2,89,405 Patented June 2, 1959 2 will become apparent from the ensuing description of an illustrative embodiment thereof in the course of which reference is had to the accompanying drawings in which:

Fig. 1 is a block diagram illustrating a preferred embodiment of an automatic toll ticketing'system incorporating a toll ticketing adapter in accordance with the principles of this invention; I

Pigs. 2-14, inclusive, form a schematic drawing illustrating the details of the toll ticketing adapter embodying the present invention; and

Fig. 15 is a block diagram disclosing the manner in which Figs. 2-14, inclusive, are positioned adjacent each other to form a complete circuit diagram of the system embodying the present invention.

Referring now to Fig. 1, subscriber station A, designated by the reference .numeral 110, is connected to a conventional line circuit 1-12 which is individual thereto. In a .manner Well known in the art, the initiation of a call by a subscriber at-station A causes conductor S1 to be marked and a start signal to be applied to conventional line finder allotter 114; whereupon line finder allotter 114 causes a previously allotted line finder 116 to :hunt for and find line circuit 112 with its marked conductor S1. After the finding of the line circuit 112, the call is extended from station A through line circuit 112,-conductors T1 and R1 and through line finder 116 to first selector 113 to eifect the seizure thereof, and -a holding ground is returned to line circuit 112 over conductor S1.

Normally conductor HSl is not connected to any point of potential. However, in certain'cases, such as where subscriber station A is .a pay station, for instance, it is desirable to prevent such a station from originating an automatic toll call. In .thesecases,-the H81 conductor is marked with ground potential.

Line finder al1otter114, after causing the operation of line finder 116, is effective in allotting another line finder for the next succeeding call. Conductors T1, R1, S1, and H81, respectively, are also-connected to the banks of a connector (not shown) for extending an incoming call to subscriber station A.

First selector 118, upon the seizure thereof, returns dial tone over theextendedtconnection to subscriberstation A. Should thevsubscriber station A wish to make an automatic toll call, he first dials a predetermined access digit, such as 2 in the illustrated embodiment shown in Fig. 1. This causes the conductor wipers T2, 1R2, S2 and H82, respectively, of first selector 118 to contact the second level of the first selector switch, thereby further extending the connection through conductors T3, R3, S3, and H83, respectively, to 'toll ticketing adapter 129 to effect the seizure thereof.

Toll ticketing adapter 120 incorporates circuit means therein responsive to seizure thereof for extending the connection both to a data storage means, suchas recorder 122, associated therewith, which has an elongated record medium for recording billing information pertaining to a large number of calls, and through conductors T4, R4, S4, and H84, respectively, to a second selector 124.

Should subscriber station A be one which is restricted from making automatic toll calls, ground will be extended from the H81 conductor to the H83 conductor. Tollticketing'adapter 120 includes means therein responsive to ground beingipresent on the H83 conductor for preventing the extension of the connection to either recorder .122, or second selector '124 and for returning 'busy tone over talking conductors T3 and R3.

thereby. However, toll ticketing adapter 120 includes 122 and to second selector 124.

Assuming that the first digit of the directory number of the called subscriber is 7, Wiper conductors T5, RS,

SS, and H85, respectively, of second selector 124 are moved into contact with the seventh level of the second selector switch to thereby extend the connection to a multi-access trunk circuit, such as two-way trunk circuit 126, over conductors T6, R6, S6, and H86, respectively.

'Two-way trunk circuit 126 is efiective in extencfing the connection over trunk line I, designated by the reference numeral 128, to remote switching apparatus 130 located at a first distant office. The remaining dialed digits of the directory number are effective in operating remote switching apparatus 130 to complete the connection between calling subscriber station A and called subscriber station B, designated by the reference numeral 132, served by the first distant office. Conductors T8, R8, S8, and H88, respectively, are utilized in connecting twoway trunk circuit 126 to the banks of an incoming selector (not shown), for incoming calls.

In a similar manner, if the first digit of the directory number of the called subscriber is 8, the second selector 124 is effective in extending the connection to a multi-access trunk circuit, such as two-way trunk circuit 134, rather than two-way trunk circuit 126. In this case, the dialing of the remaining digits of the directory number extend the connection through trunk line II, designated by the reference numeral 136, to operate remote switch ing apparatus 138 located at a second distant ofiice to complete the connection between calling subscriber A and called subscriber C, designated by the reference numeral 140, served by the second distant office.

Although the embodiment illustrated in Fig. 1 provides access to a plurality of distant ofiices, sometimes access to only a single distant ofiice is desired. In that case, second selector 124 may be omitted and toll ticketing adapter 120 may be connected directly to a trunk circuit.

Toll ticketing adapter 120 includes means therein for counting the number of dialed digits applied thereto after seizure thereof, and further includes means therein responsive to answer supervision signals applied thereto. Should an answer supervision signal be returned to toll toll ticketing adapter 120 before both the party digit and all the digits of the directory number of the called subscriber have been counted, means are provided in toll ticketing adapter 120 which break the extended connection to recorder 122 and second selector 124 and return busy tone to the calling subscriber at station A. However, in response to an answer supervision signal being returned to toll ticketing adapter 120 after both the party digit and all the digits of the directory number have been counted, means are provided in toll ticketing adapter 120 which call for the calling subscriber identification circuitry.

The calling subscriber identification circuitry is described in detail in the above-identified copending application of Clement and Harris. Briefly, however, an allotter start signal AST is applied from toll ticketing adapter 120 to identifier sender allotter 144. In response thereto, identifier sender allotter 144 causes one of a group of identifier senders 146 to become associated through cable 150 with the toll ticketing adapter 120; whereupon an identification start signal is applied from this identifier sender over cable 150 to toll ticketing adapter 120. In response to the identification start signal, a tone signal is applied to conductor H53, and through the extended connection to conductor l-ISl, where it is then applied to identification matrix 142. Identification matrix 14-2 consists of a plurality of groups of resistance clusters. The H81 conductor is connected to certain ones of these resistance clusters in accordance with the directory number of calling subscriber station A. Other subscriber stations, similar to subscriber station A, are connected to identification matrix 142 in accordance with their respective directory numbers.

Identifier circuit 148 is selectively operated in accordance with the particular energization of the resistance clusters of identification matrix 142 to thereby provide marking conditions extending to the identifier sender associated with toll ticketing adapter 120. This identifier sender then transmits a plurality of series of impulses manifesting the directory number of the calling station, such as station A, through toll ticketing adapter 120 to recorder 122.

In response to the identification of the calling subscriber being completed, toll ticketing adapter 120 drops the identification circuitry and calls in clock and calendar circuit 154 which is connected thereto through cable 152. Clock and calendar circuit 15 which is described in detail in the above-identified application of Clement and Harris, transmits a plurality of series of pulses manifesting the time and date of the call through toll ticketing adapter 125 to recorder 122.

Toll ticketing adapter 120 further includes means responsive to an answer supervision signal for timing the duration of the call. After the transmission of clock and calendar information is completed, toll ticketing adapter 120 is conditioned to periodically apply impulses manifesting the duration of the call to recorder 122.

Should the calling subscriber at station A hang up after a supervisory signal is returned, but prior to the transmission of identification information, toll ticketing adapter 123 is conditioned to hold the extended connection until the identification information is recorded by recorder 122, then wink off, releasing the preceding equipment, but maintaining toll ticketing adapter 120 busy until the clock and calendar information is recorded. Similarly, should calling subscriber at station A hang up after identification is complete, but prior to the recording of clock and calendar information, the preceding equipment will be released, but toll ticketing adapter 120 will remain busy until this clock and calendar information is recorded.

In a similar manner billing information pertaining to a plurality of other toll calls may be recorded on the elongated medium of recorder 122.

At periodic intervals, usually in the early morning when traffic is light, a signal is sent from clock and calendar circuit 154 over conductor 158 to initiate operation of playback circuit means 156. Although the playback circuit means described in detail in the above-identified copending application of Clement and Harris may be used, this invention contemplates the preferred use of the improved playback circuit means which forms the subject matter of the copending application of B. A. Harris, Serial No. 611,218, filed September 21, 1956, which application is assigned to the same assignee as the present application. This improved playback circuit means is featured by the fact that should the toll ticketing adapter 120 be busy with a call at the time playback circuit means 156 is associated therewith, playback circuit means 156 will wait for a predetermined period of time before it switches to a succeeding toll ticketing adapter. Should the busy condition of toll ticketing adapter 120 terminate before the end of this waiting period, all the billing information which has been recorded by recorder 122 will be played back. However, if it is desired that the billing information recorded by recorder 122 not be played back during a particular playback cycle, toll ticketing adapter 120 includes a key asaaeoa.

which may be operated, which when operated causes playback circuit means 156 to pass by toll ticketing adapter 129 without any waiting period.

Playback circuit means 156 is connected to toll ticketing adapter bya number of wires included in cable 160 which are common to a whole group of toll ticketing adapters. In addition, playback circuit means 156 is coupled to toll ticketing adapter 120 byconductor'C and conductor CS which are individual to toll ticketing adapter 120. The significance of these conductors will become apparent from the detailed description of toll ticketing adapter 12% which follows. Playback circuit means 156 serves to apply the played-back signals from recorder 122 to the readout facilities 162, which utilizes the signals to produce printed toll tickets. Readout facilities 162, which form no .part of the present invention, are described in detail in the above-identified copending application of Clement and Harris.

Referring now to Figs. 2-14, which show the detailed circuitry of toll ticketing adapter 120, the first numeral of the reference number identifying each respective element thereof locates theparticular figure in which each respective element is located; i.e., all elements located in Fig. 2 are identified with reference numbers beginning with the numeral 2, all elements located in Fig. 3 are identified with reference numbers beginning with 3, etc.

As heretofore discussed, the equipment directly succeeding toll ticketing adapter 120 may be second selector 124 or, if the automatic toll ticketing system is designed to serve only a single distant oifice, may be a twoway trunk circuit or other type multi-access trunk cirlCl-lit. Should the equipment directly succeeding toll ticketing adapter 120 be a multi-access trunk circuit, busy marking conductor S4, extending therefrom, shown in Fig. 10, is connected through normally closed contacts ZRDSS, rectifier ZRFl, which is so connected as to be conductive in the direction shown, through normally closed contacts 2RDS2 and normally closed contacts 4PBY1 of the playback switch to busy marking conductor S3 of toll ticketing adapter 12%, shown in Fig. 2. Whenever this trunk circuit isrendered busy over one of its other points of access, ground potential'is applied to conductor S4 and returned over the above-described connection to conductor S3. The presence'of ground on conductor S3 serves to mark toll ticketing adapter 120 as busy to thepreceding equipment, and thereby prevents seizure thereof by a calling subscriber. Thus, if toll ticketing adapter 120 is followed directly by a multiaccess trunk circuit, toll ticketing adapter 120 is placed in a busy condition in response to the succeeding trtnik circuit being in a busy condition. However, in the case where second selector 124 is employed, the above-described connection between conductor S4 and conductor S3 may be omitted.

Assuming that toll ticketing adapter 120 is not in a busy condition, it may be seized by first selector 118, to thereby complete a loop between conductors T3-and'R3, shown in Fig. 2. This causes the energization of calling bridge relay ZCB through a connection extending from ground, designated through the upper'winding of calling bridge relay 20B, normally closed contacts llZTBl to conductor T3, the completed loop between conductors T3 and R3, the conductor R3, andthrough the lower winding of calling bridge relay ZCB to grounded battery, designated Accordingly, calling bridge relay 2GB is operated to close normally open contacts 2CB1 and 2CB2, respectively, thereof, and to open normally closed contacts 2CB3 and 2CB4, respectively, thereof.

The closure of contacts 2CB2 completes an energizing path for release delay relay 2RD, extending'from ground through operated contacts 2CB2 and the operating winding of release delay relay 2RD to grounded battery. Release delay relay 2RD therefore operates, closing normally open contacts 2RD1, ZRDZ, 3RD1, 3RD3 and 3RD4, respectively, thereo'f,'and opening normally closed contacts 3RD2 and 3RD5, respectively, thereof.

The'closure ofcontacts ZRDl completes an energization pathfor release delay slave relay ZRDS, extending from ground through operated contacts 2RD1 and the operating winding-of release delay slave relay ZRDS to grounded battery. This causes-release delay slave relay ZRDS to operate, closing normally open contacts ZRDSl, 2RDS4, 2RDS5, ARDSI, -3RDS3 and 3RDS4, respectively, thereof, and opening normally closed contacts ZRDSZ, -2RDS3, '3RDS2, BRDSS and 3RDS6, respectively, thereof.

The closure of contacts 3RDS3 and 3RDS4 results in monitor lamp being'energized by 'a-connection extending from ground through operated contacts 3RDS4 and ERDSS), normally closed contacts 7SR2, and monitor lampilL'to grounded battery. Therefore, monitor lamp 3L shines steadily bright, indicating that toll ticketing adapter has beenseized and a call is in the process of being extended.

The closure of contacts BRDS of release delay relay 2RD applies ground to conductor S3 through operated contacts 3RD3 and normally closed contacts 4PBY1 of the'playback release switch. The presence of ground on conductor S3 serves to mark toll ticketing adapter 120 as busy to the'preceding equipment, and thereby'prevents seizure thereof 'by'another calling subscriber.

Assuming that the call is originating from a non-restricted calling subscriber line, which is free to utilize the automatic toll'ticketing facilities, the closure of con tacts '2RDS1 and 2RDS4, respectively, of release delay slave relay ZRDS completes a loop between conductors T4 and R4, shown in'Fig. '10, extending from conductor T4 through operated contacts 2RDS1, retard coil 'tSRE, operated contacts ZCBl shunted by normally closed contacts 10ONR1, and "through normally closed contacts SR8?) and operated contacts 2RDS4 to conductor R4. The completion of a loop between conductors T4 and R4 results in the seizure of the succeeding equipment, which may be second selector 124 or a two-Way trunk circuit, if the toll ticketing circuitry serves only a single distant ofiice.

Should the call'originate'from a station which is restricted from making'use of the automatic toll ticketing circuitry, as heretofore described, ground will be present on conductors HS3,shown in Fig. '4. The presence of ground on conductor H83 causes the energization of the lower winding of restricted service'relay'SRS, through a circuit extending from conductor HS3,.normally closed contacts 9ID3 and the lower'winding ofrestricted service relay 8R8 to grounded battery. The resulting operation of restricted service relay 8R8 is effective in opening normally closed contacts SRSI, 8RS2 and 8RS3, respectively, thereof and closing normally open contacts 3RS4 and 8RS5, respectively, thereof. The closure of ERSS causes busy tone to be applied to the T3 conductor from the conductor ET-120IPM conductor, shown in Fig. 4, through capacitor SCI and operated contacts SRSS to the T3 conductor. The opening of contacts 8RS3, in response to the operation of restricted service relay 8R5, prevents the completion of the loop between conductors T4 and R4, thereby preventing the further extension of a connection through the succeeding equipment. The significance of the other contacts controlled by restricted service relay 8R8 will be discussed in'detail below.

After the seizure of'toll ticketing adapter 120 is completed, and the-calling bridge relay ZCB, the release delay relay 2RD and therelease delay slave relay ZRDS have been operated, the calling subscriber proceeds to sequentially dial apredetermined number of directive signals, the first of which is a party digit designating the party position of the calling subscriber on a party line and the remainder of which are the directory number of the called subscriber.

In the preferred embodiment described herein this predetermined number of directive signals is eight.

In response to the first pulse of the first directive signal the loop between conductors T3 and R3 is broken, causing relay 2C3 to restore. The restoration of calling bridge relayZCB causes contacts 2CB1 thereof, which form part of the loop between conductors T4 and R4, to open. However, the opening of contacts 2CB1 has no effect at this time, since these contacts are shunted by normally closed contacts 10ONR1.

The restoration of calling bridge relay ZCB further causes contacts 2CB2 thereof to be reopened, and contacts 2CB3 and contacts 2CB4 thereof to be reclosed. The reopening of contacts 2CB2 results in release delay relay 2RD being deenergized, but since this relay is slow to release, it does not restore at this time.

If a call originates from a non-restricted station, the reclosing of contacts 2CB3 serves to complete a connection for operating shunt relay 38H, which connection extends from ground through reclosed contacts 3CB3, normally closed contacts 11ONR4, operated contacts 3RD1, normally closed contacts 8RS1, the operating winding of shunt relay SSH in parallel with resistor 3R2 to grounded battery. Should the call originate from a restricted station, restricted service relay 8R8 is operated, in the manner described above, thereby opening normally closed contacts SRSI, so that no operating connection is extended to shunt relay 35H.

Assuming, however, that the call originates from a non-restricted station, shunt relay SSH is operated to close normally open contacts ZSHI and ZSHZ, respectively, thereof, and to open normally closed contacts 3SH1 and 381-12, respectively, thereof. The closing of contacts 2SH1 serves to short circuit retard coil GRE through a circuit extending fiom one side of retard coil 6RE through operated contacts 2SH1 and normally closed contacts 6SRS1 to the other side of retard coil 6RE. The closure of contacts 2SH2 causes the energization of second shunt relay ZSHS through a connection extending from ground through operated contacts 281-12 and the operating winding of second shunt relay 2SHS to grounded battery.

In response to the energization thereof, second shunt relay ZSHS operates to open normally closed contacts ZSHSI, 2SHS2 and 3SHS2, respectively, thereof, and to close normally open contacts 381-181 and 3SI-IS3, respectively, thereof.

The reclosing of contacts 2CB4, in response to the restoration of calling bridge relay 2GB, completes a path for operating mark relay 7MK, which path extends from grounded battery through the operating winding of mark relay 7MK in parallel with resistor 7R1, through normally closed contacts 11ONR3, reclosed contacts 2CB4, normally closed contacts SRSZ and operated contacts 2RD2 to ground. Again, if the call originates from a restricted station, this connection is not completed, since restricted service relay SRS is then operated and normaliy closed contacts 8RS2 are open.

Assuming, however, that the call originates from a non-restricted station, mark relay 7MK is operated, closing normally open contacts 7MK1 and 7MK2, respectively, thereof. The closure of contacts 7MK2 causes the energization of mark head 13MKH, located in recorder 122 associated with toll ticketing adapter 120, through a connection extending from ground through normally closed contacts 7MKS2, operated contacts 7MK2, normally closed contacts CS10, conductor MKH, mark head 13MKH, conductor MKC, normally closed contacts 5CS13, and resistor 5R4 to grounded battery. In addition, conductor MKH is connected to grounded battery through resistor 9R2 and conductor MKC is connected to grounded battery through resistor 9R1.

Although the recorder is described in detail in the above-identified copending application of Clement and Harris, it might be well at this time to point out that the recorder contemplated by this invention utilizes a continuous magnetic tape as a record medium. The tape is provided with either three closely spaced perforations or foil contacts, which locate an initial starting position on the tape. The tape may be alternately driven intermittently by means of a ratchet drive magnet or continuously by means of a clutch magnet which couples the tape to a rotating shaft. Mark pulses, recorded on a first channel of the tape, manifest each item of billing information. Space pulses, recorded on a second channel of the tape, separate successive items of billing information. Coe signals, consisting of coincident mark and space pulses, are recorded at the termination of each call in order to separate one call from another. In addition, a preliminary Coe signal is recorded immediately beyond the last of the perforations at the initial starting pointof the tape. An erase head is also provided for removing previously recorded mark and space pulses. The operation of the recorder will become clearer as the description proceeds.

Returning now to the description of Figs. 2-14, the closure of contacts 7MK1 energizes second mark relay 7MKS through a connection extending from ground, through operated contacts 7MK1 and the operating Winding of second mark relay 7MKS in parallel with resistor 7R2 to grounded battery. This causes second mark relay 7MKS to operate, closing normally open contacts 7MKS1 thereof and opening normally closed contacts 7MKS2 thereof. The opening of contacts 7MKS2 breaks the previously described connection through operated contacts 7MK2 for energizing mark head 13MKH, thereby ending the recording of the first mark pulse. The closure of contacts 7MKS1 extends a connection from ground, through conductor RA, and ratchet drive magnet 13RDM and normally closed clutch magnet interrupter contacts 13CLM1 in the recorder, to grounded battery, thereby energizing ratchet drive magnet 13RDM. Conductor RA is also connected to grounded battery through serially connected resistor 12R1 and capacitor 12C1. This results in ratchet drive magnet 13RDM operating to move the magnetic tape one step forward.

At the end of the first pulse of the first dialed directive signal, calling bridge relay ZCB is reoperated, causing normally closed contacts 2CB4 to be opened. The opening of contacts 2CB4 breaks the above-described energizing path for mark relay 7MK. Therefore, mark relay 7MK restores, opening normally open contacts 7MK1. The opening of contacts 7MK1 breaks the previously described connection for energizing second mark relay 7MKS. Therefore, second mark relay 7MKS restores, opening normally open contacts 7MKS1, thereby breaking the previously described connection for energizing ratchet drive magnet 13RDM.

In reoperating, calling bridge relay 2CB also recloses normally open contacts 2CB2, thereby reenergizing release delay relay RD, which has not restored due to its slow release characteristics, and opens normally closed contacts 2CB3. The opening of contacts 2CB3 breaks the previously described connection for energizing the shunt relay SSH. However, since shunt relay SSH is also slow to release, neither it nor second shunt relay 2SHS, controlled thereby, releases at this time.

Each of the remaining pulses of the first dialed directive signal causes calling bridge relay ZCB to be sequentially restored and then reoperated. In response thereto, mark relay 7MK, second mark relay 7MKS, mark head ISMKH, and ratchet drive magnet ISRDM operate in the manner described above to record a number of additional spaced marked pulses on the magnetic tape equal in number to the remaining pulses of the first dialed directive signal.

At the finish of the last pulse of the first dialed directive signal, calling bridge relay ZCB remains operated, thereby maintaining normally closed contacts 2CB3 there of open, so that the operating path for shunt relay 35H resistor R3 togrounded battery.

assaaos ond shunt relay ZSHS is also aslow to release relay, it

does not restore for a certain period of time. During thisperiod of time, between the restoration of shunt relay 33H and the restoration of second shunt relay ZSHS, respective operating paths are established for the X drive magnet HPSX of the programming switch and for space relay 7SP.

The operating path for'space relay 7SP extends from ground through normally closed contacts 7 SRS4, operated contacts 3SHS3, normally closed contacts'3SH2 and the operating winding of space relay 7SP in parallel with resistor 7R3 to grounded battery. Space relay '78? therefore operates, closing normally open contacts 7SP2 thereof, which extends an energizing path to space head 13SPH in the recorder from ground through normally closed contacts 7SPS2, operated contacts 7SP2, normally closed contacts 5CS8, conductor SPH, space head ISSPH, conductor SPC, normally closed contacts 5CS7, and

In additidmconductor SPH is connected to grounded battery through resistor 13R1 and conductor SPC is connected to grounded battery through resistor 13R2.

The operation of space relay 7SP further closes normally open contacts 7SP1 to provide an operating path for second space relay TSPS extending from ground through operated contacts 7SP1 and the winding of second space relay 7SPS in parallel with resistor 7R to grounded battery. Second space relay '7SPS therefore operates, opening normally closed contacts 7SPS2 thereof, and closing normally open contacts 7SP1 thereof. The opening of contacts 7SPS2 breaks the previously described connection for energizing space head ISSPH, ending the recording of the first space pulse, and the closure of con tacts 7SPS1 applies operating ground through the previously described circuit for energizing ratchet drive magnet BRDM.

The operating path, mentioned above, for X drive magnet llPSX of the programming switch extends from ground, through normally closed contacts SSH operated contacts SSHSll and the operating winding of the X drive magnetlllPSXZ to grounded battery. In response to the energization thereof, X drive magnet lilrPSX causes the respective wipers of banks 1ilPSA,1llPSB, lilPSC and MPSD to move off normalto contact the number 1 step position of the programming switch. in moving off normal, the normally open oif normal contacts EHPSONI and llPSONZ, respectively, of the programming switch are closed. The closure of 0d normal contacts HPSONZ provides an operating path for off normal relay lIlONR extending from ground through operated contacts HPSONZ and the operating winding of off normal relay 11ONR to grounded battery. Oif normal relay MONR therefore operates to open normally closed contacts liiONRll, 7ONR1, 110N113, and lllONRd, respectively,

thereof, and to close normally open contacts HONRZ thereof.

In response to the closure of contacts 110N112, end of call relay 1156 is energized by a circuit extending from ground through operated contacts HONRZ and the operating Winding of end of call relay illEC to grounded battery. Therefore, end of call relay 1113C operates to close contacts ltiECi, liiEClllECl, TEECZ and lIiECd, respectively, thereof, and open contacts 11EC3, thereof. End of call relay llliEC is shunted by serially connected resistor 11111 and capacitor 1102.

After this, second shunt relay ZSHS restores.

The calling subscriber now dials the second directive signal. In response to each pulse of the second directive signal, calling bridge relay ZCB sequentially restoresand reoperates, causing contacts ZCBll thereof to reopen and reclose in synchronism therewith. Since ofi normal relay HONR has previously been operated, contacts ZCBI are no longer shunted by normally'closed contacts NR1, as they were during the dialing'of the first directive signal manifesting the party digit" of the calling subscriber. The pulsing of contacts-2081, therefore, serves'to successively interrupt theloop between conductors T4 "and R4, thereby repeating the second dialed directive signal to the succeeding equipment. Contacts ZCBl are-shunted by serially connected resistor 2R2 and capacitor 2C1, which prevent sparking across-these contacts.

In response to the restoration of calling bridge relay 2.013 by the first pulse of thesecond directive signal, an operating path for shunt relay 3SH'is established, which path extends from ground, through reclosed contacts 2CB3, the common conductor and wiper of bank ilPSC of the programming switch to step position 1 thereof, and then through operated contacts 3RD1, normal contacts 8R8! and the operating winding of shunt relay 35H in parallel'with resistor 3R2'to grounded battery. Shunt relay 38H and second shunt relay ZSHS, controlled thereby, reoperate in the same manner and with 'thesame effect as previously'described in connection with the dialing of the first directive signal. Since both shunt relay SSH and second shunt relay ZSHS are slow to release, they remain operated until the interdigit time following the dialing of the second directive signal.

The reclosing of contacts 2CB4, of calling bridge relay 2C8, in response to each pulse 'of the second dialed directive. signal, establishes an operating path'for mark relay 'ZMK, which path extends from grounded battery, through the operating winding of mark relay 7MK in parallel with resistor 7R1, the common conductor and wiper of bank iliPSB of the programming switchto step position 1 thereof, and then through reclosed'contacts 2034, normally closed contacts SRSZ, and operated contacts 2RD2 to ground. Therefore,mark relay 7MK,'and second mark relay YMKS controlled thereby, operate in the manner previously described in connection with the first dialed directive signal to sequentially operate mark head BMKH and ratchet drive magnet 1-3RDM in the recordor to record on the magnetic tape a series of spaced markedpulses equal in number tothe number of-pulses in the second directive signal.

Upon the completion of the dialing of the second directive signal, slow to release shunt relay SSH restores, and during the period prior to the restorationof slow to 'release'second shunt relayZSHS, is effective, in the manner previously described in connection with the first dialed directive signal, in establishing operating paths for programming switch X drive magnet 11PSX and space relay 78?. In response thereto, the wipers of the programming switch are stepped to the number 2 position, and space relay 78F, and second space relay 7SPS, controlled thereby, operate spacehead 13-SPH and ratchet drive magnet 13RDM, in the manner previously described, to record'a second' space pulse on themagnetic tape.

Since step positions 2-'to 7, inclusive, of banks llZiPSB and llPSC, respectively, ofthe programming switch are connectedin parallel with step'positions 1 thereof, the sequential dialing of each'of the remaining six directive signals isefiective in operating toll ticketing adapter m a manner identical to that just described in connection with the second dialed directive sig nal. Thus, upon the completion'of the'dialing of the eighth directive signal, which isthe last-digit of the directory number of the called subscriber,"the wipers of the programming switch are'stepped'to the number -8-position thereof.

The foregoing description assumes thatthe calling subscriber has dialed correctly. Should the calling subscriber have dialed the wrong number, it may,depending upon the details of the succeeding switching circuitry, be possible that a connection'isexterided to some other subscriber onto an operators position, although the calling subscriber has dialed fewer than the full complement of directive signals. In that case, if the wrong number answers, an answer supervision signal, consisting of resistance battery, will be returned over the H84 conductor, shown in Fig. 10. The presence of an answer supervision signal on conductor H84 is effective in operating supervisory relay 6SR through a connection extending from conductor H84 through normally closed contacts AS2 of the artificial supervision key, the operating winding of supervisory relay 68R, normally closed contacts 7SRS2, normally closed contacts 10AS3 of the artificial supervision key, and operated contacts 3RDS1 to ground.

Supervisory relay 6RS in operating, closes normally open contacts 6SR1 and 7SR1, respectively, thereof, and opens normally closed contacts 7SR2 thereof. The closure of contacts 6SR1 provides an energizing path for timer motor 6TM extending from grounded battery through operated contacts 6SR1 and timer motor 6TM in parallel with serially connected resistor 6R1 and capacitor 6C1 to ground. This initiates the rotation of a drive shaft coupled to timer motor 6T M.

The closure of contacts 7SR1 provides an energizing path for timer clutch 11TCL, which path extends from ground through operated contacts IIECZ and 7SR1, and the operating winding of timer clutch llTCL to grounded battery. The operation of timer clutch IITCL couples the rotating shaft of timer motor 6TM to timer NCI contacts 10TM1 and timer minute contacts 11TM1, respectively.

The opening of contacts 7SR2, which are in the previously described operating path for monitor lamp 3L, breaks a connection through operated contacts 3RDS3 which shunts resistor 3R1, so that now resistor 3R1 is inserted in series with monitor lamp 3L, and monitor lamp 3L shines steadily dim, indicating that the call has been extended to an answering station,

A short predetermined time interval following energization of timer motor 6TM and timer clutch 11TCL, timer NCI contacts 10TM1 are closed, providing an operating path for second supervisory relay 6SRS extending from grounded battery through the operating winding of second supervisory relay 6R8, now closed contacts 10TM1, operated contacts ZRDSS, and normally closed contacts SALMZ to ground.

In response to the operation thereof, supervisory relay 6SRS6 opens normally closed contacts 6SRS1, 7SRS2, 7SRS4, and 7SRS5, respectively, thereof, and closes normally open contacts 6SRS2, 6SRS3, 6SRS4, GSRSS, 6SRS6, 6SRS7, 6SRS8, 7SRS1, 7SRS3, and 7SRS6, respectively, thereof. The closure of contacts 6SRS7, which shunt timer NCI contacts 10TM1, provides a holding ground for second supervisory relay 6SRS.

Since an answer supervision signal was returned prior to the dialing of the full complement of directive signals, the closure of contacts 6SRS4 is effective in providing an operating path for restricted service relay 8R8 through a connection extending from ground through operated contacts 2RD2 and 6SRS4, any one of step positions 1 to 7, inclusive, of bank PSA of the programming switch, and upper operating Winding of the restricted service relay 8R8 to grounded battery. Therefore, restricted service relay 8R8 operates to open normally closed contacts 8RS1, 8RS2, and 8RS3, respectively, thereof, and close normally open contacts 8RS4 and 8RS5, respectively, thereof.

The closure of contacts 8RS4 provides a holding ground for restricted service relay SRS through a connection extending from ground through operated contacts ZRDZ and 8RS4 to the upper operating winding of the restricted service relay 8R8.

As discussed above in connection with a call originating from a restricted station, the opening of contacts =8RS1 breaks the operating path for shunt relay SSH, the opening of contacts 8RS3 breaks the operating path for mark relay 7MK, the opening of contacts 8RS3 breaks the loop between conductors T4 and R4, thereby releasing the succeeding equipment, and the closure of contacts SRSS is effective in returning busy tone to the calling subscribed over conductor T3. Thus, in response to an answer supervision signal being returned prior to the dialing of the full complement of directive signals, toll ticketing adapter is prevented from maintaining an extended connection and from recording any further billing information.

Assuming now, however, that the full complement of directive signals have been dialed correctly, a talking connection is extended to the dialed subscriber over conductor T3, normally closed contacts 12TB1, capacitor ltlCl, operated contacts 2RDS1, and conductor T4; and over conductor R3, capacitor 2C2, operated contacts 2RDS4, and conductor R4. Furthermore, the wipers of the programming switch have been advanced, in the manner previously described, to the number "8 step position of banks ltlPSA, llPSB, HPSC, and 11PSD thereof.

If the called subscriber should now be busy, a flash ing resistance battery signal is returned over conductor H84, and is applied to supervisory relay R over the path previously described in connection with the return of an answer supervision signal prior to the dialing of the full complement of directive signals. This causes supervisory relay 68K to operate and restore in synchronism with the flashing resistance battery signal applied thereto. As described above, the operation of supervisory relay 68R results in the energization of timer motor 6T M and timer clutch 11TCL, which initiate a timing cycle of timer NCI contacts 10TM1 and timer minute contacts 11TM1. However, in this case, supervisory relay 68R restores long before the completion of the timing cycle of timer NCI contacts HTML and in re sponse thereto, timer NCI contacts 10TM1 return to their initial starting position. This happens on each reoperation and restoration of supervisory relay 68R. Therefore, when the called subscriber station is busy, the timing mechanism is ineffective in closing timer NCI contacts IOTM1. Hence, second supervisory relay GSRS remains unoperated.

Assuming, however, that the called subscriber is not busy, but answers his phone, an answer supervision signal, consisting of resistance battery, is returned over the H84 conductor. Therefore, supervisory relay 65R and second supervisory relay 6SRS are operated, in the manner previously described in connection with the return of an answer supervision signal prior to the dialing of the full complement of directive signals.

The opening of contacts 6SRS1, in response to the operation of second supervisory relay 6SRS, further breaks the circuit through normally open contacts ZSHl shunting retard coil 6RE. Therefore, subsequent operation of shunt relay 35H will be ineffective in shunting retard coil 6RE. The closure of contacts 6SRS2 provides a shunt across contacts ZCBI, so that any addi* tional directive signals, which the calling subscriber may attempt to dial, will not be repeated to the succeeding equipment. The opening of contacts '7SRS5 removes the operating ground for space relay TSP, so that space relay 7SP will now not be energized in the interim between the restoration of shunt relay SSH and the restoration of second shunt relay ZSHS in the manner previously described.

Since the wipers of the programming switch are now in contact with the number 8 step position of bank EOPSA, no connection is extended to operate restricted service relay 8R8, but, instead, an operating path is provided for line identification relay SLlD. This operating path extends from ground through operated contacts 2RD2, the number 8 step position of bank 10PSA of the programming switch, normally closed contacts ZSHSl, operated contacts 6SRS5, and the operating wind- 

